Camera optical lens comprising seven lenses of ++−++−− and ++−−+−− refractive powers

ABSTRACT

The present disclosure relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50, 1.70≤n4≤2.20, −2.00≤f3/f4≤2.00, 0.00≤(R13+R14)/(R13−R14)≤10.00 and 1.70≤n6≤2.20, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n4 denotes a refractive index of the fourth lens; n6 denotes a refractive index of the sixth lens; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, in particular, to a camera optical lens suitable for handheld devices, such as smart phones and digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lens with good imaging quality therefore have become a mainstream in the market. In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structure gradually appear in lens designs. There is an urgent need for ultra-thin wide-angle camera lenses which with good optical characteristics and fully corrected aberration.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to Embodiment 1 of the present disclosure.

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1.

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1.

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1.

FIG. 5 is a schematic diagram of a structure of a camera optical lens according to Embodiment 2 of the present disclosure.

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5.

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5.

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5.

FIG. 9 is a schematic diagram of a structure of a camera optical lens according to Embodiment 3 of the present disclosure.

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9.

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9.

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DETAILED DESCRIPTION OF EMBODIMENTS

To make the objects, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawings, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 of Embodiment 1 of the present disclosure, the camera optical lens 10 includes seven lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. An optical element such as an optical filter GF can be arranged between the seventh lens L7 and an image surface Si.

The first lens L1, the second lens L2, the third lens L3, the fifth lens L5 and the seventh lens L7 are all made of plastic material. The fourth lens L4 and the sixth lens L6 are both made of glass material.

Here, a focal length of the camera optical lens 10 is defined as f, a focal length of the first lens L1 is defined as f1, and the camera optical lens 10 should satisfy a condition of 1.51≤f1/f≤2.50, which specifies a positive refractive power of the first lens L1. A value lower than a lower limit may facilitate a development towards ultra-thin lenses, but the positive refractive power of the first lens L1 may be too powerful to correct such a problem as aberration, which is unbeneficial for a development towards wide-angle lenses. On the contrary, a value higher than an upper limit may weaken the positive refractive power of the first lens L1, and it will be difficult to realize the development towards ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 1.52≤f1/f≤2.49.

A refractive index of the fourth lens L4 is defined as n4, and the camera optical lens 10 should satisfy a condition of 1.70≤n4≤2.20, which specifies the refractive index of the third lens L3. Within this range, it facilitates the development towards ultra-thin lenses and correction of the aberration. Preferably, the camera optical lens 10 further satisfies a condition of 1.71≤n4≤2.18.

A focal length of the third lens L3 is defined as f3, a focal length of the fourth lens L4 is defined as f4, and the camera optical lens 10 should satisfy a condition of −2.00≤f3/f4≤2.00, which specifies a ratio of the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4. This can effectively reduce a sensitivity of the camera optical lens and further enhance an imaging quality. Preferably, the camera optical lens 10 further satisfies a condition of −1.99≤f3/f4≤1.99.

A curvature radius of an object-side surface of the seventh lens L7 is defined as R13, a curvature radius of an image-side surface of the seventh lens L7 is defined as R14, and the camera optical lens 10 further satisfies a condition of 0.00≤(R13+R14)/(R13−R14)≤10.00, which specifies a shape of the seventh lens L7. Within this range, a development towards ultra-thin and wide-angle lens would facilitate correcting a problem like an off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of 0.01≤(R13+R14)/(R13−R14)≤9.99.

A refractive index of the sixth lens L6 is defined as n6, and the camera optical lens 10 should satisfy a condition of 1.70≤n6≤2.20, which specifies the refractive index of the sixth lens L6. Within this range, it facilitates the development towards ultra-thin lenses and the correction of the aberration. Preferably, the camera optical lens 10 further satisfies a condition of 1.71≤n6≤2.18.

A total optical length from an object-side surface of the first lens L1 to the image surface Si of the camera optical lens along an optical axis is defined as TTL.

When a focal length f of the camera optical lens 10, the focal length f1 of the first lens L1, the focal length f3 of the third lens L3, the focal length f4 of the fourth lens L4, the refractive index n4 of the fourth lens L4, the refractive index n6 of the sixth lens L6, the curvature radius R13 of the object-side surface of the seventh lens L7, and the curvature radius R14 of the image-side surface of the seventh lens L7 all satisfy the above conditions, the camera optical lens 10 has an advantage of high performance and satisfies a design requirement of low TTL.

In an embodiment, the object-side surface of the first lens L1 is convex in a paraxial region, an image-side surface of the first lens L1 is concave in the paraxial region, and the first lens L1 has a positive refractive power.

A curvature radius of the object-side surface of the first lens L1 is defined as R1, a curvature radius of the image-side surface of the first lens L1 is defined as R2, and the camera optical lens 10 further satisfies a condition of −10.99≤(R1+R2)/(R1−R2)≤−1.94. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, the camera optical lens 10 further satisfies a condition of −6.87≤(R1+R2)/(R1−R2)≤−2.43.

An on-axis thickness of the first lens L1 is defined as d1, and the camera optical lens 10 further satisfies a condition of 0.03≤d1/TTL≤0.12. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.05≤d1/TTL≤0.09.

In an embodiment, an object-side surface of the second lens L2 is convex in the paraxial region, an image-side surface of the second lens L2 is convex in the paraxial region, and the second lens L2 has a positive refractive power.

The focal length of the camera optical lens 10 is defined as f, the focal length of the second lens L2 is defined as f2, and the camera optical lens 10 further satisfies a condition of 0.44≤f2/f≤1.80. By controlling a positive refractive power of the second lens L2 within a reasonable range, correction of the aberration of the optical system can be facilitated. Preferably, the camera optical lens 10 further satisfies a condition of 0.70≤f2/f≤1.44.

A curvature radius of the object-side surface of the second lens L2 is defined as R3, a curvature radius of the image-side surface of the second lens L2 is defined as R4, and the camera optical lens 10 further satisfies a condition of −1.46≤(R3+R4)/(R3−R4)≤−0.15, which specifies a shape of the second lens L2. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem of an on-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of −0.92≤(R3+R4)/(R3−R4)≤−0.18.

An on-axis thickness of the second lens L2 is defines as d3, and the camera optical lens 10 further satisfies a condition of 0.04≤d3/TTL≤0.15. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.07≤d3/TTL≤0.12.

In an embodiment, and the third lens L3 has a negative refractive power.

A focal length of the third lens L3 is defined as f3, and the camera optical lens 10 further satisfies a condition of −6.79≤f3/f≤−0.90. An appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −4.24≤f3/f≤−1.13.

A curvature radius of an object-side surface of the third lens L3 is defined as R5, a curvature radius of an image-side surface of the third lens L3 is defined as R6, and the camera optical lens 10 further satisfies a condition of −5.54≤(R5+R6)/(R5−R6)≤1.94. This can effectively control a shape of the third lens L3, thereby facilitating shaping of the third lens and avoiding bad shaping and generation of stress due to an the overly large surface curvature of the third lens L3. Preferably, the camera optical lens 10 further satisfies a condition of −3.46≤(R5+R6)/(R5−R6)≤1.55.

An on-axis thickness of the third lens L3 is defined as d5, and the camera optical lens 10 further satisfies a condition of 0.02≤d5/TTL≤0.11. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.03≤d5/TTL≤0.09.

In an embodiment, an object-side surface of the fourth lens L4 is concave in the paraxial region, an image-side surface of the fourth lens L4 is convex in the paraxial region, and the fourth lens L4 has a refractive power.

A focal length of the fourth lens L4 is defined as f4, and the camera optical lens 10 further satisfies a condition of f4/f≤1.95. The appropriate distribution of refractive power makes it possible that the system has the better imaging quality and the lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of f4/f≤1.56.

A curvature radius of the object-side surface of the fourth lens L4 is defined as R7, a curvature radius of the image-side surface of the fourth lens L4 is defined as R8, and the camera optical lens 10 further satisfies a condition of −2094.45≤(R7+R8)/(R7−R8)≤2.75, which specifies a shape of the fourth lens L4. Within this range, a development towards ultra-thin and wide-angle lens would facilitate correcting a problem like an off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of −1309.03≤(R7+R8)/(R7−R8)≤2.20.

An on-axis thickness of the fourth lens L4 is defined as d7, and the camera optical lens 10 further satisfies a condition of 0.02≤d7/TTL≤0.19. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.03≤d7/TTL≤0.15.

In an embodiment, the fifth lens L5 has a positive refractive power.

A focal length of the fifth lens L5 is defined as f5, and the camera optical lens 10 further satisfies a condition of 0.59≤f5/f≤4.27, which can effectively make a light angle of the camera lens gentle and reduce an tolerance sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of 0.94≤f5/f≤3.41.

A curvature radius of an object-side surface of the fifth lens L5 is defined as R9, a curvature radius of an image-side surface of the fifth lens L5 is defined as R10, and the camera optical lens 10 further satisfies a condition of −6.32≤(R9+R10)/(R9−R10)≤34.29, which specifies a shape of the fifth lens L5. Within this range, a development towards ultra-thin and wide-angle lenses can facilitate correcting a problem of the off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of −3.95≤(R9+R10)/(R9−R10)≤27.43.

An on-axis thickness of the fifth lens L5 is defined as d9, and the camera optical lens 10 further satisfies a condition of 0.04≤d9/TTL≤0.23. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.07≤d9/TTL≤0.18.

In an embodiment, the sixth lens L6 has a negative refractive power.

A focal length of the sixth lens L6 is defined as f6, and the camera optical lens 10 further satisfies a condition of −9.20≤f6/f≤−0.46. The appropriate distribution of refractive power makes it possible that the system has the better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −5.75≤f6/f≤−0.57.

A curvature radius of an object-side surface of the sixth lens L6 is defined as R11, a curvature radius of an image-side surface of the sixth lens L6 is defined as R12, and the camera optical lens 10 further satisfies a condition of −6.60≤(R11+R12)/(R11−R12)≤6.31, which specifies a shape of the sixth lens L6. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem of the off-axis aberration. Preferably, the camera optical lens 10 further satisfies a condition of −4.12≤(R11+R12)/(R11−R12)≤5.05.

An on-axis thickness of the sixth lens L6 is defined as d11, and the camera optical lens 10 further satisfies a condition of 0.05≤d11/TTL≤0.20. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.08≤d11/TTL≤0.16.

In an embodiment, the image-side surface of the seventh lens L7 is concave in the paraxial region and the seventh lens L7 has a negative refractive power.

A focal length of the seventh lens L7 is defined as f7, and the camera optical lens 10 further satisfies a condition of −16.76≤f7/f≤−0.40. The appropriate distribution of refractive power makes it possible that the system has the better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 further satisfies a condition of −10.48≤f7/f≤−0.50.

An on-axis thickness of the seventh lens L7 is defined as d13, and the camera optical lens 10 further satisfies a condition of 0.03≤d13/TTL≤0.13. This can facilitate achieving ultra-thin lenses. Preferably, the camera optical lens 10 further satisfies a condition of 0.04≤d13/TTL≤0.11.

In an embodiment, the total optical length TTL of the camera optical lens 10 is less than or equal to 8.45 mm, which is beneficial for achieving ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens 10 is less than or equal to 8.07 mm.

In an embodiment, an F number of the camera optical lens 10 is less than or equal to 1.96. The camera optical lens has a large aperture and a better imaging performance. Preferably, the F number of the camera optical lens 10 is less than or equal to 1.92.

With such designs, the total optical length TTL of the camera optical lens 10 can be made as short as possible, thus the miniaturization characteristics can be maintained.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object-side surface of the first lens to the image surface of the camera optical lens along the optical axis) in mm.

Preferably, inflexion points and/or arrest points can be arranged on the object-side surface and/or the image-side surface of the lens, so as to satisfy the demand for high quality imaging. The description below can be referred for specific implementations.

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1 R d nd νd S1 ∞ d0 = −0.226 R1 2.537 d1 = 0.547 nd1 1.5439 ν1 55.95 R2 5.184 d2 = 0.336 R3 4.168 d3 = 0.594 nd2 1.5439 ν2 55.95 R4 −26.970 d4 = 0.055 R5 65.382 d5 = 0.230 nd3 1.6713 ν3 19.24 R6 8.367 d6 = 0.380 R7 −12.936 d7 = 0.849 nd4 1.7174 ν4 29.50 R8 −3.795 d8 = 0.283 R9 −2.645 d9 = 1.059 nd5 1.6397 ν5 23.53 R10 −2.424 d10 = 0.035 R11 −8.043 d11 = 0.940 nd6 1.7174 ν6 29.50 R12 −15.038 d12 = 0.328 R13 −4.655 d13 = 0.390 nd7 1.6713 ν7 19.24 R14 4.473 d14 = 0.160 R15 ∞ d15 = 0.210 ndg 1.5168 νg 64.20 R16 ∞ d16 = 0.622

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radius for a lens;

R1: curvature radius of the object-side surface of the first lens L1;

R2: curvature radius of the image-side surface of the first lens L1;

R3: curvature radius of the object-side surface of the second lens L2;

R4: curvature radius of the image-side surface of the second lens L2;

R5: curvature radius of the object-side surface of the third lens L3;

R6: curvature radius of the image-side surface of the third lens L3;

R7: curvature radius of the object-side surface of the fourth lens L4;

R8: curvature radius of the image-side surface of the fourth lens L4;

R9: curvature radius of the object-side surface of the fifth lens L5;

R10: curvature radius of the image-side surface of the fifth lens L5;

R11: curvature radius of the object-side surface of the sixth lens L6;

R12: curvature radius of the image-side surface of the sixth lens L6;

R13: curvature radius of the object-side surface of the seventh lens L7;

R14: curvature radius of the image-side surface of the seventh lens L7;

R15: curvature radius of an object-side surface of the optical filter GF;

R16: curvature radius of an image-side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lens;

d0: on-axis distance from the aperture S1 to the object-side surface of the first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image-side surface of the seventh lens L7 to the object-side surface of the optical filter GF;

d15: on-axis thickness of the optical filter GF;

d16: on-axis distance from the image-side surface to the image surface of the optical filter GF;

nd: refractive index of the d line;

nd1: refractive index of the d line of the first lens L1;

nd2: refractive index of the d line of the second lens L2;

nd3: refractive index of the d line of the third lens L3;

nd4: refractive index of the d line of the fourth lens L4;

nd5: refractive index of the d line of the fifth lens L5;

nd6: refractive index of the d line of the sixth lens L6;

nd7: refractive index of the d line of the seventh lens L7;

ndg: refractive index of the d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 0.0000E+00 −1.5270E−02 −5.5978E−03 −1.3828E−03  −8.6345E−04 1.0429E−04  7.5417E−05 2.0813E−06 R2 0.0000E+00 −3.2285E−02 −6.1582E−03 −1.8579E−04   1.3838E−04 5.1707E−04 −1.4672E−04 7.1344E−06 R3 0.0000E+00 −1.9875E−02 −1.7017E−03 3.4355E−03  2.0211E−03 −4.4666E−04  −4.3466E−05 9.0500E−07 R4 0.0000E+00 −1.3741E−02 −3.5011E−03 9.6905E−04  6.2367E−04 1.2455E−04  6.4706E−05 −4.4812E−05  R5 0.0000E+00  8.7927E−03 −4.4599E−02 4.7320E−02 −4.6722E−02 3.0101E−02 −9.3573E−03 1.1088E−03 R6 0.0000E+00  2.0436E−02 −7.0286E−02 8.8097E−02 −9.0338E−02 5.6590E−02 −1.7600E−02 2.2379E−03 R7 0.0000E+00 −1.1673E−02 −1.7645E−02 1.6570E−02 −2.7475E−02 1.8598E−02 −4.8142E−03 3.9320E−04 R8 0.0000E+00 −8.2343E−03 −2.0078E−02 3.0408E−02 −3.6806E−02 2.1933E−02 −6.1079E−03 6.4717E−04 R9 0.0000E+00 −1.1174E−02 −1.2621E−02 4.9808E−02 −6.6538E−02 3.8905E−02 −1.0771E−02 1.1338E−03 R10 0.0000E+00 −7.0789E−02  1.4988E−01 −1.0044E−01   3.6875E−02 −7.9023E−03   9.1996E−04 −4.4155E−05  R11 0.0000E+00 −8.7188E−02  1.2898E−01 −9.3272E−02   3.6874E−02 −8.5440E−03   1.0683E−03 −5.4862E−05  R12 0.0000E+00  6.9945E−02 −3.4999E−02 9.1083E−03 −1.5438E−03 1.6295E−04 −9.7141E−06 2.4734E−07 R13 0.0000E+00  9.4994E−02 −4.9869E−02 1.3738E−02 −2.3658E−03 2.5860E−04 −1.6462E−05 4.5759E−07 R14 0.0000E+00 −1.9009E−02 −1.9902E−03 4.8505E−04 −9.1757E−06 −3.9177E−06   3.1298E−07 −7.0873E−09 

Here, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, and A16 are aspheric surface coefficients.

IH: Image height y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶  (1)

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object-side surface and the image-side surface of the first lens L1, P2R1 and P2R2 represent the object-side surface and the image-side surface of the second lens L2, P3R1 and P3R2 represent the object-side surface and the image-side surface of the third lens L3, P4R1 and P4R2 represent the object-side surface and the image-side surface of the fourth lens L4, P5R1 and P5R2 represent the object-side surface and the image-side surface of the fifth lens L5, P6R1 and P6R2 represent the object-side surface and the image-side surface of the sixth lens L6, and P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7. The data in the column named “inflexion point position” refer to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refer to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

TABLE 3 Number(s) of Inflexion point Inflexion point Inflexion point inflexion points position 1 position 2 position 3 P1R1 1 1.025 P1R2 1 0.655 P2R1 0 P2R2 1 1.215 P3R1 2 0.445 1.185 P3R2 2 0.735 1.105 P4R1 0 P4R2 0 P5R1 0 P5R2 1 2.015 P6R1 0 P6R2 2 0.305 1.215 P7R1 3 0.535 1.005 2.975 P7R2 2 0.965 3.525

TABLE 4 Number(s) of Arrest point Arrest point arrest points position 1 position 2 P1R1 0 P1R2 1 1.095 P2R1 0 P2R2 0 P3R1 2 0.655 1.395 P3R2 0 P4R1 0 P4R2 0 P5R1 0 P5R2 0 P6R1 0 P6R2 2 0.545 1.655 P7R1 0 P7R2 1 1.715

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 10 according to Embodiment 1, respectively. FIG. 4 illustrates a field curvature and a distortion with a wavelength of 588 nm after passing the camera optical lens 10 according to Embodiment 1. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows various values of Embodiments 1, 2, 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the above conditions.

In this Embodiment, an entrance pupil diameter of the camera optical lens is 2.921 mm, an image height of 1.0H is 4.00 mm, a FOV (field of view) in a diagonal direction is 70.74°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5 R d nd νd S1 ∞ d0 = −0.226 R1 2.470 d1 = 0.450 nd1 1.5439 ν1 55.95 R2 3.915 d2 = 0.295 R3 4.194 d3 = 0.696 nd2 1.5439 ν2 55.95 R4 −6.532 d4 = 0.055 R5 −30.764 d5 = 0.230 nd3 1.6510 ν3 21.51 R6 5.798 d6 = 0.329 R7 −219.010 d7 = 0.856 nd4 1.9515 ν4 29.83 R8 −219.429 d8 = 0.314 R9 25.814 d9 = 0.590 nd5 1.6150 ν5 25.92 R10 −4.657 d10 = 0.525 R11 19.663 d11 = 0.646 nd6 1.9515 ν6 29.83 R12 2.986 d12 = 0.293 R13 5.420 d13 = 0.612 nd7 1.6510 ν7 21.51 R14 3.613 d14 = 0.082 R15 ∞ d15 = 0.210 ndg 1.5168 νg 64.20 R16 ∞ d16 = 0.649

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 0.0000E+00 −1.6395E−02 −6.7659E−03 −1.3205E−03  −7.4565E−04 8.9784E−05  4.6899E−05 2.0575E−06 R2 0.0000E+00 −3.0618E−02 −6.6434E−03 −3.7941E−04   2.6204E−04 5.7898E−04 −2.0957E−04 7.1684E−06 R3 0.0000E+00 −2.1557E−02 −1.6040E−03 3.3406E−03  1.8981E−03 −4.8548E−04  −6.6078E−05 8.2442E−06 R4 0.0000E+00 −1.0521E−02 −2.8161E−03 1.3067E−03  6.8866E−04 1.0310E−04  4.9814E−05 −4.6086E−05  R5 0.0000E+00 −2.5654E−03  4.8236E−03 −2.6550E−02   1.1952E−02 3.9134E−03 −3.1435E−03 4.8661E−04 R6 0.0000E+00  2.2613E−04 −4.6077E−03 4.6787E−05 −1.6987E−02 1.7270E−02 −5.4008E−03 5.5759E−04 R7 0.0000E+00 −2.5030E−02 −1.8346E−03 2.2481E−02 −2.9713E−02 1.5909E−02 −3.4212E−03 2.1627E−04 R8 0.0000E+00 −3.2184E−02 −1.6681E−02 2.6539E−02 −1.9390E−02 7.8313E−03 −1.5809E−03 1.2402E−04 R9 0.0000E+00  2.7167E−02 −6.7001E−02 4.6998E−02 −2.4109E−02 7.0171E−03 −8.9082E−04 1.7199E−05 R10 0.0000E+00  7.6120E−02 −6.7030E−02 3.9620E−02 −1.7449E−02 4.8486E−03 −7.1662E−04 4.2571E−05 R11 −1.1348E+03  −1.3185E−02 −4.5446E−02 3.1790E−02 −1.3423E−02 3.3288E−03 −4.4108E−04 2.4390E−05 R12 0.0000E+00 −7.6204E−02  1.4372E−02 −4.0103E−04  −7.8886E−04 1.9020E−04 −1.8152E−05 6.2932E−07 R13 0.0000E+00 −1.0448E−01  4.0567E−02 −6.6890E−03  −1.2962E−04 1.8316E−04 −2.2145E−05 8.6485E−07 R14 0.0000E+00 −9.2156E−02  2.8954E−02 −6.4523E−03   9.1382E−04 −7.8808E−05   3.7283E−06 −7.4346E−08 

Table 7 and table 8 show design data of inflexion points and arrest points of each lens of the camera optical lens 20 lens according to Embodiment 2 of the present disclosure.

TABLE 7 Number(s) of Inflexion point Inflexion point inflexion points position 1 position 2 P1R1 1 1.015 P1R2 1 0.755 P2R1 0 P2R2 1 1.215 P3R1 1 1.205 P3R2 2 0.875 1.075 P4R1 1 1.275 P4R2 0 P5R1 1 0.575 P5R2 0 P6R1 2 0.345 2.065 P6R2 2 0.725 2.815 P7R1 2 0.425 2.845 P7R2 2 0.585 3.365

TABLE 8 Number of arrest points Arrest point position 1 P1R1 0 P1R2 1 1.275 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 0.845 P5R2 0 P6R1 1 0.565 P6R2 1 1.505 P7R1 1 0.815 P7R2 1 1.215

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 588 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies the above conditions.

In an embodiment, an entrance pupil diameter of the camera optical lens is 2.904 mm, an image height of 1.0H is 4.00 mm, a FOV (field of view) in the diagonal direction is 70.92°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9 R d nd νd S1 ∞ d0 = −0.226 R1 2.951 d1 = 0.597 nd1 1.5439 ν1 55.95 R2 4.264 d2 = 0.321 R3 4.445 d3 = 0.663 nd2 1.5439 ν2 55.95 R4 −8.940 d4 = 0.055 R5 −7.169 d5 = 0.552 nd3 1.6713 ν3 19.24 R6 −15.267 d6 = 0.719 R7 −2.988 d7 = 0.329 nd4 2.1540 ν4 17.15 R8 −4.204 d8 = 0.065 R9 3.731 d9 = 0.746 nd5 1.6713 ν5 19.24 R10 7.187 d10 = 0.732 R11 5.365 d11 = 0.729 nd6 2.1540 ν6 17.15 R12 3.305 d12 = 0.608 R13 4.562 d13 = 0.623 nd7 1.5439 ν7 55.95 R14 3.731 d14 = 0.110 R15 ∞ d15 = 0.210 ndg 1.5168 νg 64.20 R16 ∞ d16 = 0.625

Table 10 shows aspherical surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10 Conic coefficient Aspheric surface coefficients k A4 A6 A8 A10 A12 A14 A16 R1 0.0000E+00 −1.4691E−02 −2.8746E−03 −8.1159E−04 −3.5574E−04 2.5191E−04 −3.9154E−05  1.8582E−06 R2 0.0000E+00 −3.0479E−02 −5.6473E−03  1.2845E−03  9.8157E−06 3.6200E−04 −1.3081E−04  9.3132E−06 R3 0.0000E+00 −2.4984E−02 −4.5556E−03  1.4950E−03  1.7893E−03 −3.9412E−04  −8.1998E−06 −8.9485E−06 R4 0.0000E+00 −1.8002E−02 −2.5642E−03  1.0163E−03  3.8454E−04 −5.3843E−05   2.2810E−05 −1.3701E−05 R5 0.0000E+00  5.0819E−03 −3.3407E−03 −1.9867E−03  6.4864E−05 4.6914E−04 −4.7940E−05 −8.2603E−06 R6 0.0000E+00  6.2985E−03 −4.3496E−03 −2.0199E−03  2.2442E−05 4.0162E−04 −2.0368E−05 −1.5639E−05 R7 0.0000E+00 −1.3054E−02  1.2250E−02 −1.5207E−02  1.1392E−02 −4.8389E−03   1.0714E−03 −9.6761E−05 R8 0.0000E+00 −4.5852E−02  1.5172E−02 −1.4507E−03 −1.0176E−03 6.0331E−04 −1.7671E−04  2.2073E−05 R9 0.0000E+00 −3.1082E−02 −1.5723E−02  1.4573E−02 −6.9208E−03 1.8927E−03 −3.2144E−04  2.4090E−05 R10 0.0000E+00  5.3037E−02 −5.1707E−02  2.4047E−02 −6.8728E−03 1.1843E−03 −1.1230E−04  4.4852E−06 R11 −1.1809E+01  −2.9974E−02  3.5556E−03 −3.1189E−04 −3.4441E−05 1.7319E−05 −1.3064E−06 −1.7895E−08 R12 0.0000E+00 −6.8914E−02  1.8403E−02 −5.1582E−03  1.0875E−03 −1.4778E−04   1.1082E−05 −3.4566E−07 R13 0.0000E+00 −6.6656E−02  5.6721E−04  1.9601E−03 −3.6863E−06 −7.3264E−05   9.3176E−06 −3.5250E−07 R14 0.0000E+00 −4.5783E−02 −9.4783E−04  1.6661E−03 −2.7458E−04 2.0366E−05 −7.2108E−07  9.2721E−09

Table 11 and Table 12 show design data inflexion points and arrest points of the respective lenses in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11 Number(s) Inflexion Inflexion Inflexion Inflexion Inflexion of inflexion point point point point point points position 1 position 2 position 3 position 4 position 5 P1R1 1 1.105 P1R2 1 0.755 P2R1 3 0.915 1.025 1.535 P2R2 0 P3R1 1 1.435 P3R2 0 P4R1 0 P4R2 1 1.735 P5R1 1 0.785 P5R2 2 1.215 2.405 P6R1 1 0.685 P6R2 1 0.745 P7R1 5 0.535 2.065 2.135 2.735 2.905 P7R2 2 0.725 3.455

TABLE 12 Number of arrest points Arrest point position 1 P1R1 0 P1R2 1 1.385 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R1 1 1.365 P5R2 1 2.195 P6R1 1 1.265 P6R2 1 1.515 P7R1 1 0.945 P7R2 1 1.315

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 486 nm, 588 nm and 656 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 588 nm after passing the camera optical lens 30 according to Embodiment 3.

Table 13 in the following lists values corresponding to the respective conditions in an embodiment according to the above conditions. Obviously, the embodiment satisfies the above conditions.

In an embodiment, an entrance pupil diameter of the camera optical lens is 3.211 mm, an image height of 1.0H is 4.00 mm, a FOV (field of view) in the diagonal direction is 65.40°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis aberrations are fully corrected, thereby achieving excellent optical characteristics.

TABLE 13 Parameters and conditions Embodiment 1 Embodiment 2 Embodiment 3 f 5.549 5.517 6.101 f1 8.508 11.080 15.168 f2 6.676 4.801 5.550 f3 −14.314 −7.476 −20.700 f4 7.208 −34950844.457 −10.459 f5 15.783 6.463 10.636 f6 −25.539 −3.771 −9.200 f7 −3.340 −19.217 −51.128 f12 4.014 3.620 4.391 FNO 1.90 1.90 1.90 f1/f 1.53 2.01 2.49 n4 1.72 1.95 2.15 f3/f4 −1.99 2.14E−07 1.98 (R13 + R14)/ 0.02 5.00 9.98 (R13 − R14) n6 1.72 1.95 2.15

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the scope of the present disclosure. 

What is claimed is:
 1. A camera optical lens comprising, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens; wherein the second lens has a positive refractive power, an object-side surface of the second lens is convex in a paraxial region, an image-side surface of the second lens is convex in the paraxial region, wherein the camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50; 1.70≤n4≤2.20; −2.00≤f3/f4≤2.00; 0.70≤f2/f≤1.44; −0.92≤(R3+R4)/(R3−R4)≤−0.18; 0.07≤d3/TTL≤0.12; 0.00≤(R13+R14)/(R13−R14)≤10.00; and 1.70≤n6≤2.20; where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n4 denotes a refractive index of the fourth lens; n6 denotes a refractive index of the sixth lens; f2 denotes a focal length of the second lens; R3 denotes a curvature radius of the object-side surface of the second lens; R4 denotes a curvature radius of the image-side surface of the second lens; d3 denotes an on-axis thickness of the second lens; TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.
 2. The camera optical lens according to claim 1 further satisfying following conditions: 1.52≤f1/f≤2.49; 1.71≤n4≤2.18; −1.99≤f3/f4≤1.99; 0.01≤(R13+R14)/(R13−R14)≤9.99; and 1.71≤n6≤2.18.
 3. The camera optical lens according to claim 1, wherein the first lens has a positive refractive power, an object-side surface of the first lens is convex in a paraxial region and an image-side surface of the first lens is concave in the paraxial region; and the camera optical lens further satisfies following conditions: −10.99≤(R1+R2)/(R1−R2)≤−1.94; 0.03≤d1/TTL≤0.12; where R1 denotes a curvature radius of the object-side surface of the first lens; R2 denotes a curvature radius of the image-side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 4. The camera optical lens according to claim 3 further satisfying following conditions: −6.87≤(R1+R2)/(R1−R2)≤−2.43; and 0.05≤d1/TTL≤0.09.
 5. A camera optical lens comprising, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; and a seventh lens; wherein the third lens has a negative refractive power, wherein the camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50; 1.70≤n4≤2.20; −2.00≤f3/f4≤2.00; −4.24≤f3/f≤−1.13; −3.46≤(R5+R6)/(R5−R6)≤1.55; 0.03≤d5/TTL≤0.09; 0.00≤(R13+R14)/(R13-R14)≤10.00; and 1.70≤n6≤2.20; where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n4 denotes a refractive index of the fourth lens; n6 denotes a refractive index of the sixth lens; R5 denotes a curvature radius of an object-side surface of the third lens; R6 denotes a curvature radius of an image-side surface of the third lens; d5 denotes an on-axis thickness of the third lens; TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.
 6. The camera optical lens according to claim 1, wherein the fourth lens has a refractive power, and an object-side surface of the fourth lens is concave in a paraxial region, an image-side surface of the fourth lens is convex in the paraxial region, and the camera optical lens further satisfies following conditions: f4/f≤1.95; −2094.45≤(R7+R8)/(R7−R8)≤2.75; and 0.02≤d7/TTL≤0.19; where R7 denotes a curvature radius of the object-side surface of the fourth lens; R8 denotes a curvature radius of the image-side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 7. The camera optical lens according to claim 6 further satisfying following conditions: f4/f≤1.56; −1309.03≤(R7+R8)/(R7−R8)≤2.20; and 0.03≤d7/TTL≤0.15.
 8. The camera optical lens according to claim 1, wherein the fifth lens has a positive refractive power, and the camera optical lens further satisfies following conditions: 0.59≤f5/f≤4.27; −6.32≤(R9+R10)/(R9−R10)≤34.29; and 0.04≤d9/TTL≤0.23; where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object-side surface of the fifth lens; R10 denotes a curvature radius of an image-side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 9. The camera optical lens according to claim 8 further satisfying following conditions: 0.94≤f5/f≤3.41; −3.95≤(R9+R10)/(R9−R10)≤27.43; and 0.07≤d9/TTL≤0.18.
 10. The camera optical lens according to claim 1, wherein the sixth lens has a negative refractive power, and the camera optical lens further satisfies following conditions: −9.20≤f6/f≤−0.46; −6.60≤(R11+R12)/(R11−R12)≤6.31; and 0.05≤d11/TTL≤0.20; where f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of an object-side surface of the sixth lens; R12 denotes a curvature radius of an image-side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 11. The camera optical lens according to claim 10 further satisfying following conditions: −5.75≤f6/f≤−0.57; −4.12≤(R11+R12)/(R11−R12)≤5.05; and 0.08≤d11/TTL≤0.16.
 12. The camera optical lens according to claim 1, wherein the seventh lens has a negative refractive power, the image-side surface of the seventh lens is concave in a paraxial region, and the camera optical lens further satisfies following conditions: −16.76≤f7/f≤−0.40; and 0.03≤d13/TTL≤0.13; where f7 denotes a focal length of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis.
 13. The camera optical lens according to claim 12 further satisfying following condition: −10.48≤f7/f≤−0.50; and 0.04≤d13/TTL≤0.11.
 14. The camera optical lens according to claim 1, where a total optical length TTL from an object-side surface of the first lens to an image surface of the camera optical lens along an optical axis is less than or equal to 8.45 mm.
 15. The camera optical lens according to claim 14, wherein the total optical length TTL of the camera optical lens is less than or equal to 8.07 mm.
 16. The camera optical lens according to claim 1, wherein an F number of the camera optical lens is less than or equal to 1.96.
 17. The camera optical lens according to claim 16, wherein the F number of the camera optical lens is less than or equal to 1.92. 